Self-Cure Activator for Dental Bonding via Aryl Borate Redox
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Solution Overview
Problem
Existing self-etching adhesives are incompatible with chemically cured resins due to protonation of tertiary amines by acid components, leading to inefficient polymerization and limited compatibility with dental restoratives, necessitating a thermally stable and non-diluting self-curing activator for dual-cure applications.
Innovation Solution
A self-curing activator system containing sodium tetraphenylborate, a polymerizable resin, and an acidic compound, which promotes radical polymerization without amine compounds, ensuring compatibility with light-cure and dual-cure materials and maintaining stability during storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a peroxide-amine redox system is used for chemical polymerization, then polymerization can proceed at ambient temperature, but the amine is protonated by the acidity of the adhesive, reducing catalyst efficiency and polymerization performance
Solution Approach 1:
The patent removes the amine component from the redox catalyst system, extracting the problematic element that causes protonation by acid. The remaining peroxide is combined with alternative catalysts (metal salts, borates, or photoinitiators) that do not suffer from acid-protonation issues, thereby maintaining polymerization capability while eliminating the reliability problem.
Solution Approach 2:
The patent changes the chemical parameters of the catalyst system by replacing the amine with alternative substances having different chemical properties. These alternatives (metal salts, borates, photoinitiators) have different reactivity profiles and are not susceptible to protonation by adhesive acids, thus changing the chemical behavior parameters to achieve both ambient temperature polymerization and acid compatibility.
2Ease of manufacture
If traditional self-curing activators are used, then chemical polymerization is enabled, but they dilute the adhesive and compromise bond strength
Solution Approach 1:
The patent changes the concentration parameter by formulating the activator at extremely low levels (0.01-5% by weight), well below traditional activator concentrations. This minimal addition provides sufficient catalytic activity while having negligible dilution effect on the adhesive, thereby maintaining bond strength while enabling chemical polymerization.
Solution Approach 2:
The patent introduces alternative catalysts (metal salts, borates, or photoinitiators) as intermediary substances that enable the polymerization reaction without requiring large amounts of traditional activators. These intermediaries facilitate the redox reaction or photopolymerization at low concentrations, acting as efficient mediators that avoid the dilution problem.
3Ease of operation
If aryl borates are used as catalysts, then handling ease and stability are improved, but catalytic activity is insufficient for effective polymerization
Solution Approach 1:
The patent merges aryl borates with peroxide to create a synergistic redox catalyst system. The peroxide provides the oxidizing component while the aryl borate serves as the reducing component, and together they generate radicals at ambient temperature. This combination merges the handling ease and stability of aryl borates with the high catalytic activity of peroxide, achieving both ease of operation and high productivity.
Solution Approach 2:
The patent creates a composite catalyst system combining aryl borate with peroxide and optionally other additives (metal salts, photoinitiators). This composite approach leverages the complementary properties of each component: the stability and ease of handling from aryl borate, the high reactivity from peroxide, and enhanced catalytic activity from the synergistic interaction between components.
4Adaptability or versatility
If compatibility with both light-cure and chemical-cure materials is achieved, then versatility is improved, but system complexity increases
Solution Approach 1:
The patent creates a universal activator formulation containing peroxide combined with alternative catalysts (metal salts, borates, or photoinitiators) that can function with both light-cure and chemical-cure resin systems. This multi-functional formulation eliminates the need for separate activators for different material types, achieving versatility without proportionally increasing complexity through standardized multi-purpose chemistry.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The new activator system achieves high bond strength on both enamel and dentin, maintains stability over time, and prevents discoloration, ensuring effective bonding and compatibility with various dental materials.
Implementation Method 1
A self-curing activator system containing sodium tetraphenylborate, a polymerizable resin, and an acidic compound, which promotes radical polymerization without amine compounds
Implementation Method 2
light-activated polymerization proceeds via the generation of free radicals from the activation of a photoinitiator, usually an α-diketone, to its excited triplet state
Data Source
AI summary
A self curing activator for chemical polymerization of the interface of a dental bonding agent and a self curing or dual curing dental cement or restorative, includes an aryl borate compound, a polymerizable monomer, an optional acidic compound, an amine compound which exhibits a catalytic action, an organic peroxide containing material, and a metal compound wherein said metal compound promotes the decomposition of the organic peroxide.